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As the #1 social influencer at her high school, Anna is still discovering the advantages and drawbacks of this new status. Home alone, she's determined to gain as many followers as possible, but when the line between real and virtual is getting blurry, the night becomes bloody.。NOVA: Mysteries of Sleep Like virtually every other animal, humans need sleep to survive. But why? What do we gain from spending nearly a third of our lives in such a defenseless state? And what's at stake if we sleep poorly? The functions of sleep have long been something of a mystery. But now scientists are peering deep into the brain to see what happens while we snooze. One ...。